4 pieces, Lifespan 50,000 hours. High quality workmanship - durable - stylish look. Suitable for Campervan, Boat, Motorhome, Caravan, Yacht, Sailboat, Trailer, Kitchen, Bathroom, Cabinet, Wardrobe Installation dimensions: Mounting hole: min. 2.3"(58 mm), max. 2.55"(65 mm). Diameter 2.75"(70mm), thickness 0.5"(12mm) Full Aluminum and Super slim design: Made out of full aluminum, Conducive to the heat dissipation of the LED chip board. Thickness 0.5"(12mm), lightweight and compact body fits narrow places. Shock and vibration resistant Technical specifications: DC 12V, 3 Watt, 215 Lumen. Color Temperature 3200K(Warm White). Dimmable with PWM dimmer (acegoo 12-24V Dimmer Switch ASIN# B0B3WRJW9V) Notes: Suitable for Camper Van Motorhome with DC 12V power supply.You need a DC12V power supply to power them for home using. Transformer is not included in the package(House power is AC110V-230V. Cannot be connected to AC 12V power supply)